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Hi Michael, It has the Free float rail system ---This AR-15 semi automatic rifle from LWRC features a cold hammer forged spiral fluted barrel that dissipates heat better than conventional barrels, as well as reduces the overall weight of the rifle. The rifle is direct impingement gas operated, and equipped with ambidextrous control and an ambidextrous charging handle. Just add your sights or optic of choice and you're ready to go for duty, competition, varmint hunting or home defense. Specifications and Features: LWRC ICDIR5B18 5.56 NATO (accepts .223 Remington) Direct gas impingement semi automatic 16.1" cold hammer forged spiral fluted barrel 1:7" twist 30 rounds capacity >>>>>Free float rail system

Here is some more info CALIBER 5.56 NATO BARREL 16.1 [40.9cm] --- WEIGHT 6.6lbs [2.9kg] --- O/A LENGTH 32-35.25 [81.3-89.5cm] --- MUZZLE THREADS 1/2 x 28 TPI --- RIFLING 1:7 RH --- Features: LWRCI Modular One-Piece Free-Float Rail --- LWRCI Rail Panels and Hand Stop --- LWRCI Angled Ergonomic Fore Grip w/ QD sling point --- NiCorr-treated LWRCI DI Gas Block and Gas Tube --- LWRCI Cold-Hammer-Forged NiCorr-treated Spiral-Fluted Barrel --- LWRCI A2 Flash Hider --- Type III Hard-Coat Anodize on Receivers and Rails --- Magpul MOE+ Grip and Magpul PMAG --- LWRCI Monoforge Upper Receiver --- LWRCI Advanced Trigger Guard --- Fully Ambidextrous Lower Controls: Mag Release Bolt Catch & Release and Selector --- Mil-Spec 6-Position Buffer Tube --- H2 Buffer and Mil-Spec Buffer Spring --- LWRCI Compact Stock w/ QD sling --- LWRCI Ambidextrous Charging Handle

Modular free float rail system CALIBER 5.56 NATO BARREL 16.1" [40.9cm] WEIGHT 6.6lbs [2.9kg] O/A LENGTH 32"-35.25" [81.3-89.5cm] MUZZLE THREADS 1/2 x 28 TPI RIFLING 1:7" RH Step Up Attributes LWRCI™ Modular, One-Piece, Free-Float Rail LWRCI™ Rail Panels and Hand Stop LWRCI™ Angled Ergonomic Fore Grip w/ QD sling point NiCorr-treated LWRCI™ DI Gas Block and Gas Tube LWRCI™ Cold-Hammer-Forged, NiCorr-treated ,Spiral-Fluted Barrel LWRCI™ A2 Flash Hider Type III Hard-Coat Anodize on Receivers and Rails Magpul MOE+ Grip and Magpul PMAG LWRCI Monoforge™ Upper Receiver LWRCI™ Advanced Trigger Guard Fully Ambidextrous Lower Controls: Mag Release, Bolt Catch & Release, and Selector Mil-Spec, 6-Position Buffer Tube H2 Buffer and Mil-Spec Buffer Spring LWRCI™ Compact Stock w/ QD sling LWRCI™ Ambidextrous Charging Handle

Yes,this rifle Features a LWRCI Modular One-Piece Free-Float Rail with a "Mid-Range" Gas Block. The Gas Block looks to be in the standard location but, "LWRC Product Information" can accurately answer this part at Phone: 410-901-1348 Monday - Friday: 8:00am - 5:00 pm